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Equity-Indexed Compensation Plans - Liability and Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PAA LTIP      
Equity-Indexed Compensation Plans      
Annualized distribution probable of occurring (in dollars per unit) $ 2.90    
Outstanding (in units)      
Outstanding at beginning of period (in units) 7.3 8.4 6.0
Granted (in units) 2.1 1.2 4.1
Vested (in units) (2.1) (1.9) (1.8)
Cancelled or forfeited (in units) (0.4) (0.4) (0.3)
Conversion of PNG unit-denominated awards into PAA unit-denominated awards (in units)     0.4
Outstanding at end of period (in units) 6.9 7.3 8.4
Weighted Average Grant Date Fair Value per Unit      
Outstanding at beginning of period (in dollars per unit) $ 41.45 $ 36.97 $ 25.55
Granted (in dollars per unit) 28.76 47.68 47.60
Vested (in dollars per unit) 28.91 25.49 24.79
Cancelled or forfeited (in dollars per unit) 44.56 40.14 36.70
Conversion of PNG unit-denominated awards into PAA unit-denominated awards (in dollars per unit)     40.54
Outstanding at end of period (in dollars per unit) $ 41.23 $ 41.45 $ 36.97
Units issued in connection with the settlement of vested awards, net of tax withholding (in units) 0.5 0.6 0.5
Units withheld for taxes (in units) 0.3 0.3 0.3
Vested awards settled in cash (in units) 1.3 1.0 1.0
PAA LTIP | Liability Awards      
Equity-Indexed Compensation Plans      
Accrued liability related to all outstanding LTIP awards and DERs $ 33 $ 101  
Short-term accrued liability related to all outstanding LTIP awards and DERs 20 57  
Long-term accrued liability related to all outstanding LTIP awards and DERs $ 13 $ 44  
Annualized distribution probable of occurring (in dollars per unit) $ 2.90    
PNG LTIP      
Outstanding (in units)      
Outstanding at beginning of period (in units)     0.9
Granted (in units)     0.4
Cancelled or forfeited (in units)     (0.3)
Conversion of PNG unit-denominated awards into PAA unit-denominated awards (in units)     (1.0)
Weighted Average Grant Date Fair Value per Unit      
Outstanding at beginning of period (in dollars per unit)     $ 17.49
Granted (in dollars per unit)     17.51
Vested (in dollars per unit)     18.88
Cancelled or forfeited (in dollars per unit)     21.62
Conversion of PNG unit-denominated awards into PAA unit-denominated awards (in dollars per unit)     $ 16.41
PNG LTIP | Maximum      
Outstanding (in units)      
Vested (in units)     (0.1)